Timeline of Telescopes, Observatories, and Observing Technology - Common Era (A.D.) - 1900s

1900s

  • 1902 - Dominion Observatory, Ottawa, Canada established
  • 1904 - Observatories of the Carnegie Institution of Washington founded
  • 1907 - F.C. Brown and Joel Stebbins develop a selenium cell photometer at the University of Illinois Observatory.

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